The effect of the processing arc is not ideal, and the size is not in place

Causes of failure: The overlapping of vibration frequencies leads to resonance; processing technology; unreasonable parameter settings, excessive feed speed, and out-of-step arc processing; looseness caused by large screw clearance or out-of-step caused by over-tight screw; synchronous belt wear.

Solution: Find out the parts that generate resonance, change their frequency to avoid resonance; consider the processing technology of the workpiece material, and make a reasonable program; for the stepping motor, the processing rate F cannot be set too large; Whether the plate is too tight after wear, the gap increases or the tool holder is loose, etc.; replace the timing belt.

In mass production, occasionally the workpiece is out of tolerance

Cause of failure: The tooling fixture must be carefully checked, and considering the operator's operation method and the reliability of the clamping, due to the dimensional changes caused by the clamping, the tooling must be improved so that workers try to avoid misjudgment due to human negligence; the numerical control system may After being fluctuated or disturbed by the external power supply, an interference pulse is automatically generated, which is transmitted to the driver, causing the driver to accept the excess pulse to drive the motor to take away or less.

Solution: Understand and master its laws, try to take some anti-interference measures, such as isolation of strong electric cables with strong electric field interference from signal lines of weak electric signals, adding anti-interference absorbing capacitors, and using shielded lines to isolate, in addition, check the ground wire Whether the connection is firm, the ground contact is closest, and all anti-interference measures are taken to avoid system interference.

There are changes in the processing of a certain process of the workpiece, and the dimensions of other processes are accurate

Cause of failure: Whether the parameters of the block program are reasonable, whether they are within the predetermined trajectory, and whether the programming format meets the requirements of the manual.

Solution: If there are random teeth in the thread block and the thread pitch is wrong, then immediately think of the peripheral configuration (encoder) of the thread processing and the objective factors of this function.

Each process of the workpiece has the phenomenon of increasing or decreasing

Causes of failure: Programming errors; unreasonable system parameter settings; improper configuration settings; mechanical transmission components regularly and periodically change failures.

Solution: Check whether the instructions used by the program are executed according to the required trajectory specified in the manual. You can judge by playing the dial indicator. Position the dial indicator at the starting point of the program and let the carriage return to the starting position after the program ends, and then repeat the execution. Even if you observe the results, master the rules; check whether the system parameters are set reasonably or are considered to be changed; whether the relevant machine tool configuration meets the requirements in the connection calculation coupling parameters, and whether the pulse equivalent is accurate; check whether the transmission part of the machine tool is damaged or not, gears Whether the coupling is uniform, check whether there are periodic and regular faults and if so, check the key parts and eliminate them.

System-induced dimensional changes are not stable

Causes of failure: Unreasonable setting of system parameters; unstable working voltage; external interference caused by the system, causing the system to lose synchronization; capacitors have been added, but the impedance between the system and the driver does not match, resulting in loss of useful signals; the signal between the system and the driver is lost Abnormal transmission; system corruption or internal failure.

Solution: Whether the speed and acceleration time is too large, whether the spindle speed and cutting speed are reasonable, whether the operator's parameter modification causes the system performance to change; Add anti-interference absorbing capacitors; select appropriate capacitor models; check whether the signal connection line between the system and the driver is shielded, whether the connection is reliable, check whether the system pulse signal is lost or increased; send it to the factory for repair or replacement of the motherboard.

Conclusion

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